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Title: Fatigue-driven acceleration of abnormal grain growth in nanocrystalline wires

Abstract

In this study, molecular dynamics simulations were employed to simulate the mechanical response and grain evolution in a Ni nanowire for both static and cyclic loading conditions at both 300 and 500 K for periods of 40 ns. The loading conditions included thermal annealing with no deformation, constant 1% extension (creep loading) and cyclic loading with strain amplitudes of 0.5% and 1% for 200 cycles. Under cyclic loading, the stress–strain response showed permanent deformation and cyclic hardening behavior. At 300 K, modest grain evolution was observed at all conditions within the 40 ns simulations. At 500 K, substantial grain growth is observed in all cases, but is most pronounced under cyclic loading. This may result mechanistically from a net motion of the boundaries associated with boundary ratcheting. Finally, there is a striking qualitative consistency between the present simulation results and the experimental observation of abnormal grain growth in nanocrystalline metals as a precursor to fatigue crack initiation.

Authors:
ORCiD logo [1];  [2];  [1];  [1]
  1. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
  2. Sandia National Lab. (SNL-NM), Albuquerque, NM (United States); Clemson Univ., SC (United States)
Publication Date:
Research Org.:
Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22). Materials Sciences & Engineering Division; USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1501626
Report Number(s):
SAND-2019-2655J
Journal ID: ISSN 0965-0393; 673319
Grant/Contract Number:  
AC04-94AL85000; NA0003525
Resource Type:
Accepted Manuscript
Journal Name:
Modelling and Simulation in Materials Science and Engineering
Additional Journal Information:
Journal Volume: 27; Journal Issue: 2; Journal ID: ISSN 0965-0393
Publisher:
IOP Publishing
Country of Publication:
United States
Language:
English
Subject:
36 MATERIALS SCIENCE

Citation Formats

Foiles, Stephen M., Abdeljawad, Fadi, Moore, Alexander, and Boyce, Brad L. Fatigue-driven acceleration of abnormal grain growth in nanocrystalline wires. United States: N. p., 2018. Web. doi:10.1088/1361-651X/aaf75d.
Foiles, Stephen M., Abdeljawad, Fadi, Moore, Alexander, & Boyce, Brad L. Fatigue-driven acceleration of abnormal grain growth in nanocrystalline wires. United States. https://doi.org/10.1088/1361-651X/aaf75d
Foiles, Stephen M., Abdeljawad, Fadi, Moore, Alexander, and Boyce, Brad L. Mon . "Fatigue-driven acceleration of abnormal grain growth in nanocrystalline wires". United States. https://doi.org/10.1088/1361-651X/aaf75d. https://www.osti.gov/servlets/purl/1501626.
@article{osti_1501626,
title = {Fatigue-driven acceleration of abnormal grain growth in nanocrystalline wires},
author = {Foiles, Stephen M. and Abdeljawad, Fadi and Moore, Alexander and Boyce, Brad L.},
abstractNote = {In this study, molecular dynamics simulations were employed to simulate the mechanical response and grain evolution in a Ni nanowire for both static and cyclic loading conditions at both 300 and 500 K for periods of 40 ns. The loading conditions included thermal annealing with no deformation, constant 1% extension (creep loading) and cyclic loading with strain amplitudes of 0.5% and 1% for 200 cycles. Under cyclic loading, the stress–strain response showed permanent deformation and cyclic hardening behavior. At 300 K, modest grain evolution was observed at all conditions within the 40 ns simulations. At 500 K, substantial grain growth is observed in all cases, but is most pronounced under cyclic loading. This may result mechanistically from a net motion of the boundaries associated with boundary ratcheting. Finally, there is a striking qualitative consistency between the present simulation results and the experimental observation of abnormal grain growth in nanocrystalline metals as a precursor to fatigue crack initiation.},
doi = {10.1088/1361-651X/aaf75d},
journal = {Modelling and Simulation in Materials Science and Engineering},
number = 2,
volume = 27,
place = {United States},
year = {Mon Dec 10 00:00:00 EST 2018},
month = {Mon Dec 10 00:00:00 EST 2018}
}

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Works referencing / citing this record:

Revealing inconsistencies in X-ray width methods for nanomaterials
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